Like this:

There was a time when snafu was an acronym meaning “situation normal all f**ked up.” That time is long past. It’s now a common noun, without any capital letters. Except on Yahoo! Shine, where snafus (and SNAFUs) are all too common:

Like this:

If you’re tapping out snafu, lay off the Caps Lock key or you’ll make the same snafu that the writer for Yahoo! Shine did:

At one time, snafu was an acronym derived from “situation normal all f*cked up.” It’s not an acronym anymore and doesn’t deserve all those capital letters. It’s similar to scuba, which also started out as an acronym (self-contained underwater breathing apparatus) but is now a common noun.